ETSI - PRETS 300 118
Public Switched Telephone Network (PSTN); Category II Specification for 1 200 Bits per Second Half Duplex and 1 200/75 Bits per Second Asymmetrical Duplex Modems Standardized for Use on the PSTN Second Edition
| Organization: | ETSI |
| Publication Date: | 1 January 1996 |
| Status: | inactive |
| Page Count: | 22 |
scope:
This ETS contains the technical characteristics required for end-to-end interworking over the Public Switched Telephone Network (PSTN) of modems supporting:
- half duplex operation over the PSTN at 1 200 bit/s; and/or
- asymmetrical duplex operation over the PSTN at 1 200/75 bit/s
standardized for use over the PSTN, in accordance with CCITT Recommendation V.23 [3].
The objective of this specification, the application of which is entirely voluntary, is to provide the users with an added degree of assurance that modems in compliance with this specification can interwork with each other, under most network conditions.
The term "modem" in the context of this ETS includes all physical implementation practices for a voice band modem, which is conductively connected to the PSTN.
This ETS specifies up to four modes of operation/use (see subclause 5.2).
This ETS also contains descriptions of the tests to be performed in order to confirm compliance with the functional requirements contained herein. A general description of the test conditions and test requirements is given in annex A (normative).
NOTE: To aid reading, the term "forward channel" is sometimes used to describe the channel capable of transmitting up to 1 200 bit/s, and the term "backward channel" is similarly used to describe the channel capable of transmitting up to 75 bit/s.
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